Dustless chalk-trough



W. G. HILL.

DUSTLESS CHALK THOUGH. APPLICATION HLEDMAY 21, 1919.

1,331,767 I f Patented Feb. 24,1920.

INVENTQ'R ATTOR EY Kings and WILLIAM. G. HILL, BROOKLYN,

NEW YORK.

DUSTLESS CHALK-THOUGH.

To all whom it may concern: I

Be it known that I, WILLIAM G. HILL, a citizen of the United States,

ork, borough of Brooklyn, in the county of State of New York, have invented a new and useful Dust-less Chalkdust coming Trough, of which the following isa specifiplace with the molding stri 10 cation. 1

This invention'relates to troughs for holding chalk; and has for its objects: 1, to provide a trough so mounted in relation to a black board that all the chalk dust coming from the erasures of figures, writing, and the like,

fromthe chalk crayons, laying the same is bound to enter the trough, and be held in aneasily-removable manner; 2, to provide a chalk trough that will be securely'held in position when desired, and which can be easily andreadily removed when desired to clean it; 3, to provide a chalk trough which can bereadily emptied whendesired without breaking up, or scattering the dust; and, 4:, to provide a chalk trough which is cheap to manufacture, and efficient in use.

The invention is illustrated in the accompanying drawing, in which- I Figure 1, is proved dustless chalk trough applied to a slate blackboard-the blackboard and what is shown of the frame being also in section; and, Y

Fig. 2, is'a perspective view of the under side and inner edge of my invention.

It may be stated that whilethe invention isshown as applied to a slate blackboard; and is exceedingly desirable, and easily applied to a frame for that kind'of .ablackboard; I do not confine myself to the use of the invention solely in connection with a slate blackboard.

In the drawing, like numerals of reference refer to the same parts in each of the views.

In the practice of my invention I provide a dustless ch.lk box 8, having awire mesh top 4, on which the pieces of chalk crayons may be placed when not in use; and the wire mesh or screen a is held in place by the two side strips 5 and end strips 6 so that the box, or trough is completely covered with the screen 4:, which is spaced a sufficient distance above the bottom of the trough that the chalk dust from the pieces of crayon, or from the blackboard will have ample room to lie in Specification of Letters l atent.

Application filed May 27, 1919.

residing at New' on the-board, as well as all chalk on down, and picking them up,

may be easily displaced and taken p 'on thebottom of the trough a sectional view of my imsition all the Patented Feb. 24:, 1920.

Serial No. 300,111.

the box, or trough below the screen, as will be understood. v I I In the drawing, as previously stated, the Invention is shown as applied to a slate blackboard, aportion 7 of which is shown. This slate is spaced from the wall with the strip 8, rests on the strip 9, and is held in In mounting my improved chalk trough I prefer to provide another strip 11 directly beneath the strip 9, and face this'with a molding strip 12, having. a flat face 13; and the strips 11 and 12 may rest on a molding strip 14, as will be understood.

In practice I so proportion the parts that. my improved chalk trough will slip under the molding strip 10, holding the slate black board in place, and rest on the strips :11 and 12. This trough isheld in an easily-remov able manner so that when it is desired to remove the trough dust, or the chalk dust that has fallen into the trough, the trough itself where the dust may bedumped. As shown, I provide for the ready removal of the trough by providing the latch 15, which cooperates with the catch 16, which may be located anywhere 3 that is most desirable. The flat face 13, of the molding strip 12 provides for the easy mounting o the catch 15, as will be understood. The box, or chalk trough 3, is provided adjacent to one end with an opening 17, which lies wholly below the nettinge, so

that the chalk dust can be dumped throng this opening without "having to engage the" screen; a

In operation, the chalk trough is so mounted, as described, underneath the molding strip at the bottom of the blackboard that all chalk dust coming from the blackboard must enter the trough; and the trough is of sufficient width that there is little possibility of the dust flying outwardly beyond the same. When desired to clean the trough, the same can be easily removedby unfastening the catch at the bottom of the trough, the trough can then be taken where it is desired to dump the same and by thumping the end ofthe trough against some object while holding the trough in an inclined pochalk dust can down to the end of the trough where the opening 17 is located, and can then be dumped out through the opening 17 without board held in place with strips of molding trough 1- manner whereby all dust the necessity of passing the dust through the screen 4 and breaking up and scattering the same. After the dust has been discharged from the trough, the trough can again be placed readily understood.

It will thus be seen that I have provided a dustless chalk trough so constructed and mounted that there is no possibility of any chalk dust engaging the outer side of the and which can be cleaned in a simple and efficient manner without scattering the chalk dust. .The. mounting of the chalk trough between the molding strips, as shown provides for the firm holding of the same, while the latch and catch provides for the firm holding of the trough against displacement while in use.

I claim: 7

1. A dustless chalk trough comprising a boX, a screen cover therefor, strips to hold said screen in place, and said trough having 'an opening in one side thereof adjacent to the end beneath said screen cover, and means to close said opening with the Wall of the building when in use for the purpose set forth.v

2. The combination with a slate blackwhereby an outer strip of molding is provided at the bottom of the blackboard, of a dustless chalk trough having a screen chalk holder and an opening in the side of the box adjacent to one end beneath said screen, the side having the opening being adapted to fit under the inner, under side ofsaid outer strip of molding whereby the said molding strip partially'overhangs the in terior of said trough.

3. The combination with a slate blackboard held in place with strips of molding whereby an outer strip of molding is provided at the bottom of the blackboard, of'a dustless chalk trough having a screen chalk holder and an opening in the side ofv the box adjacentto-one end and beneath said screen, the side having the openingbeing adapted to fit under the inner, under side of said outer strip of molding whereby the said molding strip partially overhangs the interior ofsaid trough, and means to detachably hold said trough in place.

4. A dustless chalk trough comprising a box and a.wire screen mounted therein intermediateof the top and bottom, said box having an opening inone sidethereof be neath said screen, and detachable means to holdsaid trough beneath a'blackboard in a falling from said blackboard must enter said trough.

back in position, as will be 5. A chalk trough having a screen spaced from the bottom, anda discharge opening in one side thereof between the screen and the bottom of the trough and means to lose said opening with the wall of the building when in use;

6'. The combination with a blackboard of a chalk trough having a screenspaced from the bottom, and adischarge port adjacent to one end thereof between said screen and the bottom of the trough, means to direct all the chalk dust falling from said blackboard into said trough, and means to close said discharge port.

. 7. A chalk trough in combinationwith a blackboard, said trough having a screen spaced from the bottom thereof, and a discharge port in-one side thereof between the screen and the bottom of the trough, and means to hold the side of said trough'with the discharge port against the wall whereby inuse. -v I o 8, The combination with a slate -blackboard held in moldings,of a chalk trough having'a screen spaced from the bottom, and a-dischargescreen" and the bottom of the trough, means to port in one side thereof between the:

hold said trough againstthe moldingat the bottom of the blackboard in a manner whereby the molding will partially overlie said screen, and the side'of the troughhaw ing the dischargeport against thefwood" supporting said blackboard, and means to easlly remove said trough from Stud position.; l

the bottom of the blackboard with a portion of the screen cover overhung with said molding, said trough being supported on molding strip. and a the under side with a wood backing, a catch operating in con-,

place with strips of wood and the'said port is'closed while the trough is.

9. In combination, a slateblackboard.

junction with the molding on which the rests and the bottom of the the trough is securely held opening in the side thereof trough partially trough whereby in place with the against the strip slate blackboard.

Dated this 8th day of May, 1919..

WILLIAM HI-LL.

of wood supporting said 

